Evaluation of the garrapaticides currently available in Uruguay for use in livestock dispatches
With the purpose of analyzing acaricide efficacy in preparation of animal’s movement, a controlled study was carried out in a stall test, with a total of 18 acaricides (Macrociclic lactones – MLs-, Fipronil, Amidines, Synthetic Pyretroids –SP-, and mixtures with organophosphates), all of them approved for use in the Control and Eradication Campaign against Rhipicephalus (Boophilus) microplus in Uruguay. Animals were infested twice a week with 100 mg larvae of a susceptible reference strain during 25 days previous treatment. Infestations continued for a maximum period of 35 days. After treatment, animals were inspected twice a week to determine the presence of any possible viable stage of tick on the skin. Animals treated with Mixtures Cypermethrin+Ethion) and Amidines of double dosage by immersion on nine-day intervals resulted in the best option, given that animals were completely free from parasites in the shortest time. MLs (Injectable or pour-on) had an effectiveness higher than 95%. However, they could not prevent the development of any parasitic stages up to 35 days post treatment. Even though these ticks have low epidemiologic risk in spreading parasites, ML is not a good option when moving animals Animals treated with Fipronil, depending on the commercial formulation evaluated, needed between 20 and 30 days to be free from ticks, becoming a considerable option when moving animals. SPs pour-ons, Flumethrin and Alphacypermethrin with two treatments applied on 15th day intervals could not clean animals from ticks It is important to mention that the results obtained show a tendency in the behaviour of molecules. However, the study was conducted in experimental conditions and the applied methodology highly challenged the acaricide attributes. Thus, it is expectable to obtain different results on field conditions.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Sociedad de Medicina Veterinaria del Uruguay (SMVU)
2009
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| Online Access: | https://www.revistasmvu.com.uy/index.php/smvu/article/view/156 |
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